Ian Jeffreys is one of the most respected strength and conditioning coaches in the United Kingdom and a world-renowned authority on speed and agility development. He is a reader and coordinator in strength and conditioning at the University of South Wales. He is also the proprietor and performance director of All-Pro Performance based in Brecon, Wales. Ian has been a member of the National Strength and Conditioning Association (NSCA) since 1989. He is a registered strength and conditioning coach, certified strength and conditioning specialist (CSCS), and certified personal trainer (NSCA-CPT) with the NSCA and has been recertified with distinction (*D) in all categories. He was the NSCA’s High School Professional of the Year in 2006, the first time the award had ever been presented to a coach working outside the United States. In July 2009, Ian was awarded a fellowship by the NSCA for his outstanding contributions to the industry. He is an accredited strength and conditioning coach with the United Kingdom Strength and Conditioning Association (UKSCA) and was on the board of directors of the association from its founding in 2004 until 2013.Ian has authored 4 books, 10 book chapters, and numerous strength and conditioning articles that have been featured in leading international journals. He also edited the NSCA book Developing Speed (Human Kinetics, 2013).Ian has worked with numerous clubs and sport organisations around the world. He is a sought-after conference presenter and has given keynote presentations and hosted performance workshops at several worldwide conferences, including the NSCA Sport-Specific and European Conferences and the Australian Strength and Conditioning Conference.